Preamp
Test Signal Path: APx555 (Line Out) - Input 1 - Line Output - APx555 (Line In)
Input Impedance:
• Mic= 8.9 kOhms 48v Off, 5.4 kOhms 48v ON,
• Line = 24.3 kOhms,
• Hi-Z= 1.5 MOhm Unbalanced, 3 MOhm Balanced
Max Input Level:
• Mic = +17.6dBu (<0.003% THD),
• Line = +26.5dBu (<0.02% THD),
• Hi-Z = +24dBu (<0.02% THD)
Minimum Gain: Mic= 8dB, Line = 0dB, Hi-Z = 3dB
Maximum Gain: Mic = 68dB, Line = 60dB, Hi-Z = 63dB
Equivalent Input Noise (EIN):
• <-129.5dBu (150 Ohm source, unweighted), 
• <-131dBu (150 Ohm source, A-weighted), 
• <-135.5dBu (Inputs common, unweighted)
Frequency Response:
• ±0.7dB (<1 Hz to >1000 kHz, Min Gain),
• ±0.7dB (<1 Hz to >1000 kHz, 35dB Gain),
• ±1dB (<1.5 Hz to 900 kHz, 63dB Gain),
• ±1dB (<5 Hz to >200 kHz, Max Gain)
Phase Shift:
• <2.75° (20Hz to 20kHz, 40dB Gain),
• <4° (20Hz to 20kHz, 63dB Gain),
• <6° (20Hz to 20kHz, Max Gain)
THD+N: <0.00025% (1kHz, 35dB Gain, +24dBu out)
Intermodulation Distortion:
• <0.0006% (50Hz and 7kHz, 35dB gain, +20dBu out),
• <0.0005% (50Hz and 7kHz, 35dB gain, +15dBu out)
Hi-Pass Filter (HPF): 80Hz, -3dB, 12dB/Oct
CMRR: >70dB, typ >85dB, 35dB gain, 10-20kHz, 100mV Common mode
Slew Rate: 20V/uS, 35dB gain, +25dBu out
48v LED Thresholds: 
• Off = 48v Off, voltage fully discharged
• Amber = 48v voltage charging/discharging
• Red = 48v fully charged
Signal LED Meter Thresholds:
• Blue = -20dBu
• Green = -12dBu
• Amber = +21dBu
• Red = +24dBu
Max Output Level: 
• Balanced XLR = +27.5dBu (<0.002% THD, 30dB Gain) 
• Impedance Balanced ¼” Jack = +21.5dBu (<0.002% THD, 30dB Gain)
Output Impedance:
• Balanced XLR = 150 Ohm
• Impedance Balanced 1/4” Jack = 150Ohm Balanced, 75 Ohm Unbalanced
Link Max Output Level: Impedance Balanced 1/4” Jack = +21.8dBu (<0.006% THD)
Link Output Impedance: Impedance Balanced 1/4” Jack = 75 Ohm Unbalanced, 150 Ohm Balanced (Buffered Output)

Headphone Amplifier
Test Signal Path: APx555 (Line Out) - AUX Input - Headphone Output - APx555 (Line In)
Frequency Response: -1dB, <1Hz to >70kHz
THD: <0.0006% (-104.4dB) @ +20dBu, 1kHz, A-weighted, 300 Ohm load
THD+N: <0.00085% (-101.4dB) @ +20dBu, 1kHz, A-weighted, 300 Ohm load
Output Impedance: 0.33 Ohms
Output Wattage:
• 250mW x 2 @ 600 Ohms, 1kHz
• 650mW x 2 @ 220 Ohms, 1kHz
• 1.21W x 2 @ 100 Ohms, 1kHz
• 500mW x 2 @ 32 Ohms, 1kHz
Dynamic Range: 114.5dB A-weighted, AES17 method, 20Hz - 20kHz, 300 Ohm load
Noise Floor: -93.5dBu A-weighted, 20Hz - 20kHz, 300 Ohm load

Power
AC Requirements: 100V – 240V AC, 50 – 60 Hz
Total Power Consumption: 24v, 1.25A DC, 30W

Environmental
Operating Temperature: +1 to 35 degrees Celsius
Storage Conditions: -20 to 50 degrees Celsius

Dims/Weights Unit
Width: 481mm (19") (Rackmount)
Height: 44.45mm (1.75") (1u)
Depth: 240mm (9.5")
Unit Weight: 2.8kg (6.2lb)

Shipping Carton
Width: 600mm (23.6")
Height: 120mm (4.7")
Depth: 350mm (13.8")
Carton Weight: 4.1kg (9lb)

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